package com.sky.aspect;

import com.sky.annotation.AutoFill;
import com.sky.constant.AutoFillConstant;
import com.sky.context.BaseContext;
import com.sky.enumeration.OperationType;
import lombok.extern.slf4j.Slf4j;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.stereotype.Component;

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.time.LocalDateTime;
import java.time.LocalTime;

@Aspect
@Component
@Slf4j
public class AutoFillAspect {
    @Pointcut("execution(* com.sky.mapper.*.*(..)) && @annotation(com.sky.annotation.AutoFill)")
    public void autoFillPointCut(){}

    @Before("autoFillPointCut()")
    public void autoFill(JoinPoint joinPoint) throws NoSuchMethodException, InvocationTargetException, IllegalAccessException {
        log.info("开始进行公共字段的自动填充...");
        MethodSignature signature = (MethodSignature) joinPoint.getSignature(); // 方法签名对象
        AutoFill autoFill = signature.getMethod().getAnnotation(AutoFill.class);    // 获得方法上的注解对象
        OperationType operationType = autoFill.value();             // 获得数据库操作类型

        Object[] args = joinPoint.getArgs();                // 获得当前被拦截的方法的参数
        Object entity = args[0];
        LocalDateTime now = LocalDateTime.now();
        Long currentId = BaseContext.getCurrentId();

        Method setUpdateTime = entity.getClass().getDeclaredMethod(     // 利用反射来赋值
                AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class
        );
        Method setUpdateUser = entity.getClass().getDeclaredMethod(
                AutoFillConstant.SET_UPDATE_USER, Long.class
        );
        setUpdateTime.invoke(entity, now);
        setUpdateUser.invoke(entity, currentId);

        if(operationType == OperationType.INSERT) {         // 插入操作，需要对额外的属性赋值
            Method setCreateTime = entity.getClass().getDeclaredMethod(
                    AutoFillConstant.SET_CREATE_TIME, LocalDateTime.class
            );
            Method setCreateUser = entity.getClass().getDeclaredMethod(
                    AutoFillConstant.SET_CREATE_USER, Long.class
            );
            setCreateTime.invoke(entity, now);
            setCreateUser.invoke(entity, currentId);
        }
    }

}
